#11935: Make parent/element classes independent of base rings
----------------------------------------------------------+-----------------
Reporter: SimonKing | Owner:
Type: enhancement | Status:
needs_review
Priority: major | Milestone:
sage-5.10
Component: categories | Resolution:
Keywords: parent class, element class, category | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #9138, #11900, #11943, #12875, #12877 | Stopgaps:
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Description changed by nthiery:
Old description:
> At #11900 and [http://groups.google.com/group/sage-combinat-
> devel/browse_thread/thread/99c74827d704e677 sage-combinat-devel], as well
> as in some comments in sage/categories/category.py, the idea was
> discussed to make, for example,
> `Algebras(GF(3)).parent_class==Algebras(GF(5)).parent_class` - hence,
> make the parent/element classes as independent from the base of a
> category as possible.
>
> This is implemented in this patch by introducing an abstract class
> CategoryWithParameters which uses pickling by "weak construction" for
> its element and parent classes. In the process, this patch also:
>
> - Adds a method Category._make_named_class providing a unified way to
> create parent and element classes (and later on morphism classes)
> - Extends the interface of dynamic_class to customize caching and
> pickling
>
>
> __Apply__
>
> * [attachment:trac11935_weak_pickling_by_construction_rel11943-nt.patch]
New description:
At #11900 and [http://groups.google.com/group/sage-combinat-
devel/browse_thread/thread/99c74827d704e677 sage-combinat-devel], as well
as in some comments in sage/categories/category.py, the idea was discussed
to make, for example,
`Algebras(GF(3)).parent_class==Algebras(GF(5)).parent_class` - hence, make
the parent/element classes as independent from the base of a category as
possible.
This is implemented in this patch by introducing an abstract class
CategoryWithParameters which uses pickling by "weak construction" for
its element and parent classes. Now:
- For a join category, the parent/element class depend only on the
parent/element class of its super categories.
- For a Category_over_base (e.g. Modules, Algebras, Schemes, ...), the
parent/element class depend only on the category of the base.
- For a bimodule, the parent/element class depend only on the category
of the left and right bases.
In the process, this patch also:
- Adds a method Category._make_named_class providing a unified way to
create parent and element classes (and later on morphism classes)
- Extends the interface of dynamic_class to customize caching and pickling
- Rename the experimental class IdempotentSemigroups.ElementMethods
and remove its super class, and discards unused code there.
__Apply__
* [attachment:trac11935_weak_pickling_by_construction-nt.patch]
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11935#comment:81>
Sage <http://www.sagemath.org>
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